Spark-arrester



H. R. CAMPFIELD. Spa'rk-Arrester.

No. 228,442. Patented .lune 8,1880.

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MATTERS. PHOTO-LITHOGRAPMEH, WASHINGTON. D C.

NrTED STATES PATENT OFFICE.

HAMPTON R. GAMPFIELD, OF SUSQUEHANNA DEPOT, PENNSYLVANIA.

SPARK-ARRESTER. Y

SPECIFICATION forming part of Letters Patent No. 228,442, dated June 8,1880.

Application filed December 31, 1879.

To all whom t may concern:

Be it known that I, HAMPTON R. CAMP- ,FIELD, of Susquehanna Depot, inthe county of Susquehanna and State of Pennsylvania, have invented a newand useful Improvement in Spark-Arresters, of which the following' is aspecification.

The object of my invention is to provide a simpler and more effectivedevice, and less obstructive to the exhaust than those heretoforecontrived, for preventing coal-dust and sparks carried by the draftthrough smoke-stacks of locomotives from annoying the passengers of atrain, soiling their clothes, and from causing damage by setting lire towoods and prairies adjacent to the railways.

rPhe invention consists in the combination of a smoke-stack having aclosed bottom provided with a central opening, and an interior tube ofwire-cloth or perforated metal plate reaching from the said opening' inthe bottom to the top of the stack, Vwhere it is tapered, and ends witha solid tube bent downward over the edge of the stack, as will behereinafter described.

In the accompanying drawings, Figure l represents a side elevation of alocomotive-boiler provided with my invention. Fig. 2 is a verticalcentral section of the smoke-stack.

Similar letters of reference indicate like parts.

A is the boiler; a, boiler-tubes; B, boilerfurnace; C, the smoke-box;I), steam-cylinder; E, steam-exhaust nozzle from cylinder D; F, thesmoke-stack or chimney.

rIhe lower end of the smoke-stack F is closed at its junction with thesmoke-box C, except a central opening, IH, in the bottom,perpendicularly above the nozzle E, said opening being bordered on theupper side of the bottom by a vertical nipple, H', in which are formedone or more openings, 7i, whose lower edges are iiush with the bottom ofthe stack. Upon and surrounding the outer surface of the said nipple,above its side openings, h, is fitted a vertical tube, G, of wire-clothor perforated metal plate, reaching up to within a short distance of thetop of the stack, and tapering, by a cone, g, of not perforated plate,into a pipe, I, which is curved downward over the edge of the stacktoward the track, or connected with the fire-box B, as usual.

By this construction the natural draft, proportioned to the height ofthe stack F, increased by the heat and velocity of the eX- haust-steamfrom the nozzle E, causes the smoke and gases of combustion to alwayspass through the perforated tube G before escaping through the top ofthe stack F, and the sparks and coal-dust, retarded by striking againstthe sides of the tube G, fall and whirl about in the tube untildischarged by the central draft into and through the pipe ll to theground or to the boiler-furnace B.

Minute particles which may have passed through the meshes of the tube Gand fallen into the surrounding space in the stackF will gradually dropthrough the openings hinto the smoke-box C, whence, if not carriedoffthrough the pipe I by the steam-draft from the nozzle E, they may bereadily removed.

In United States Patent N o. 166,040, to which I refer as the nearestsample of the state of the art previous to this my invention, too muchobstruction is interposed to the exhaust for carrying the sparks to thepipe I and the furnace, and too little obstruction for .preventing themfrom passing out through the stack in the usual primitive way, thusmaking that device inoperative for its purpose.

Having thus described myinvention, I claim as new and desire to secureby Letters Patent- The combination, with a smoke-stack, F, provided witha central opening, H, in its bottom, of the interior perforated tube, G,with or without the nipple H', and the exterior discharge-pipe, I,forming an extension of said tube, substantially as described.

A. W. ALMQVIST, SIGFRID LINDHAGEN.

